जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Euglena is called mixotrophic because it:
सही उत्तर: ग) Photosynthesises in light but feeds heterotrophically in darkness
Euglena has chloroplasts and makes food in sunlight, but in the absence of light it absorbs organic food like a heterotroph.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'red tide' that discolours sea water and can kill fish is caused by the rapid multiplication of:
सही उत्तर: ग) Dinoflagellates such as Gonyaulax
Blooms of red dinoflagellates like Gonyaulax colour the sea red and release toxins harmful to marine animals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first approved clinical gene therapy, in 1990, was given to a child suffering from deficiency of the enzyme:
सही उत्तर: क) Adenosine deaminase (ADA)
In 1990 a four-year-old girl with ADA deficiency (a form of severe combined immunodeficiency) received her own lymphocytes carrying a functional ADA gene.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Charles Darwin made his famous five-year voyage of observation around the world aboard the ship:
सही उत्तर: ग) HMS Beagle
Darwin sailed on HMS Beagle (1831-1836), visiting places such as the Galapagos Islands, which shaped his theory.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Speciation that occurs when populations are separated by a geographical barrier such as a mountain or sea is called:
सही उत्तर: घ) Allopatric speciation
In allopatric speciation, geographic isolation stops gene flow, and the separated populations diverge into new species.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a population in Hardy-Weinberg equilibrium, 16% of the individuals show a recessive phenotype. What is the frequency of the dominant allele?
सही उत्तर: क) 0.6
q² = 0.16, so q = 0.4 and p = 1 − 0.4 = 0.6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Mesozoic era of the geological time scale is known as the:
सही उत्तर: घ) Age of reptiles
Dinosaurs and other reptiles dominated the Mesozoic era (Triassic, Jurassic and Cretaceous periods).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Proteinoid 'microspheres', proposed as possible precursors of the first cells, were produced experimentally by:
सही उत्तर: घ) Sidney Fox
Sidney Fox heated amino acids to form proteinoids, which in water formed cell-like microspheres; Oparin proposed coacervates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The close resemblance between the placental wolf and the Tasmanian wolf (a marsupial), which are not closely related, is an example of:
सही उत्तर: क) Convergent evolution
Unrelated organisms living in similar habitats evolve similar forms; this is convergent evolution producing analogous resemblance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The recapitulation theory ('ontogeny recapitulates phylogeny'), also called the biogenetic law, was proposed by:
सही उत्तर: ग) Ernst Haeckel
Ernst Haeckel stated that the development of an individual repeats the evolutionary history of its group.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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